How to do url redirects to my WordPress site and alter landing page accordingly

I would like to have some of my unrelated URLs, say bobswebsite.com/home
and maryswebsite.com/index redirect to my site, mywordpresssite.com/landingpage. And I want mywordpresssite.com/landingpage to then dynamically display the top part
of the page to show “Bob’s Website” or “Mary’s Website” depending on which link the user had previously clicked on. How hard is this to do in WordPress? Can a novice to do this or is it strictly for professionals only? Thx.